I do not own the GM manuals. I do have an old, well used and trusty Motors manual. But I do have access to the GM manuals through work. Through these and an old Snap-on scanner most things can be observed/tested, even if it is done crudely! I have a fair amount of experience with junk and low budgets.

Thats good you have manuals because with out them is just guessing I found that out the hard way! Go to the web site one of the best for chevy trucks!